纳米线
电子全息术
凝聚态物理
材料科学
涡流
垂直的
横截面
全息术
电子
方向(向量空间)
晶界
超导电性
纳米尺度
晶体结构
纳米技术
化学物理
结晶学
光学
几何学
微观结构
物理
透射电子显微镜
化学
复合材料
工程类
热力学
结构工程
量子力学
数学
作者
Ingrid Marie Vincent Andersen,Luis Alfredo Rodríguez,Cristina Bran,Cécile Marcelot,Sébastien Joulié,Teresa Hungrı́a,M. Vázquez,Christophe Gatel,E. Snoeck
出处
期刊:ACS Nano
[American Chemical Society]
日期:2019-12-11
卷期号:14 (2): 1399-1405
被引量:16
标识
DOI:10.1021/acsnano.9b07448
摘要
The magnetic configurations of cylindrical Co-rich CoNi nanowires have been quantitatively analyzed at the nanoscale by electron holography and correlated to local structural and chemical properties. The nanowires display grains of both face-centered cubic (fcc) and hexagonal close packed (hcp) crystal structures, with grain boundaries parallel to the nanowire axis direction. Electron holography evidences the existence of a complex exotic magnetic configuration characterized by two distinctly different types of magnetic configurations within a single nanowire: an array of periodical vortices separating small transverse domains in hcp rich regions with perpendicular easy axis orientation, and a mostly axial configuration parallel to the nanowire axis in regions with fcc grains. These vastly different domains are found to be caused by local variations in the chemical composition modifying the crystalline orientation and/or structure, which give rise to change in magnetic aniso-tropies. Micromagnetic simulations, including the structural properties that have been experimentally determined, allows for a deeper understanding of the complex magnetic states observed by electron holography.
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